Invincibility
At the main menu press L1, R1, L1, R1, L1, R1, L1, R1. A message at the bottom of the screen will verify proper entry.

Liquid metal textures
At the main menu press Square, Triangle, Circle, Square, Triangle, Circle. A message at the bottom of the screen will verify proper entry.

Big heads
At the main menu press R1(2x's), L1, R1. A message at the bottom of the screen will verify proper entry.

Unlimited ammunition
At the main menu press L2(4x's), L1, R1. A message at the bottom of the screen will verify proper entry.

Flame on
At the main menu press Circle, Triangle, Square, Circle, Triangle, Square. A message at the bottom of the screen will verify proper entry.

Exploding fists
At the main menu press R1(2x's), Triangle, Square, Circle, R1(2x's). A message at the bottom of the screen will verify proper entry.

Hot fists
At the main menu press L1(2x's), Circle, Square, Triangle, L1(2x's). A message at the bottom of the screen will verify proper entry.

I Got The Power mode
At the main menu press L2, Circle, L2, Circle, L2, Circle. A message at the bottom of the screen will verify proper entry. Every character in the game will have blue electrical energy flowing all through their bodies. It also seems to give your weapons more power.

Hero mode
At the main menu press L1 + Triangle with a full special meter.

Small heads
At the main menu press L1(2x's), R1, L1. A message at the bottom of the screen will verify proper entry.

Pin heads
At the main menu press Square, Circle, Triangle, Square, Circle, Triangle. A message at the bottom of the screen will verify proper entry.

Hints & Tips

Ride the elevator
At Nakatomi Plaza, after you ride ride the painter's elevator, open the elevator with the surprised guard and ride it up to the broken doors two floors above. At the main menu press the "Down" button and get out swiftly. You will be able to run and jump through the broken doors onto the elevator, and use the buttons to ride from the top. You can even shoot out the elevator's roof panels to return the elevator.